In detwinned alpha-RuCl3, low-energy magnons arise at M points transverse to the zigzag Bragg peaks, and a sixfold-symmetric continuum up to 16 meV is attributed to fractionalized Kitaev excitations.
Direct evidence for anisotropic magnetic interaction in $\alpha$-RuCl$_3$ from polarized inelastic neutron scattering
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Polarized neutron scattering experiments reveal the anisotropy of magnetic correlations in the candidate Kitaev material $\alpha$-RuCl$_3$. The anisotropy of the inelastic response at the magnetic Bragg positions is just opposite to the expectation for a simple Heisenberg model. Near the antiferromagnetic $q$ vector, there are no low-energy transversal magnon modes directly documenting the fully anisotropic and bond-directional character of the magnetic interaction in $\alpha$-RuCl$_3$. However, other findings disagree with a simple or strongly dominant Kitaev component.
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Magnetic excitations in biaxial-strain detwinned $\alpha$-RuCl$_{3}$
In detwinned alpha-RuCl3, low-energy magnons arise at M points transverse to the zigzag Bragg peaks, and a sixfold-symmetric continuum up to 16 meV is attributed to fractionalized Kitaev excitations.